A cost-benefit analysis (WAC 197-11-726) is not required by SEPA. If a cost-benefit analysis relevant to the choice among environmentally different alternatives is being considered by an agency for the proposal, it may be incorporated by reference or appended to the statement as an aid in evaluating the environmental consequences. For purposes of complying with SEPA, the weighing of the merits and drawbacks of the various alternatives need not be displayed in a monetary cost-benefit analysis and should not be when there are important qualitative considerations.